body {
    background-color: #f8f9fa;
    transition: background-color 0.3s, color 0.3s;
}

body.dark {
    background-color: #121212;
    color: #ffffff;
}

body.dark .calculator-display {
    background-color: #1e1e1e !important;
    color: #ffffff;
    border-color: #333;
}

body.dark .calculator-main {
    background-color: #1e1e1e;
}

body.dark .history-item {
    border-color: #333;
}

body.dark .btn-secondary {
    background-color: #2d2d2d;
    border-color: #444;
}

body.dark .btn-secondary:hover {
    background-color: #3d3d3d;
}

.calculator-app {
    min-height: 100vh;
    padding: 20px;
}

.calculator-main {
    background-color: #ffffff;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.calculator-display {
    min-height: 100px;
    font-size: 1.5rem;
}

.calculation-history {
    font-size: 1rem;
    min-height: 24px;
}

.display-result {
    font-size: 2rem;
    font-weight: bold;
    min-height: 50px;
}

.calculator-keypad {
    margin-top: 20px;
}

.calculator-history {
    background-color: #f1f1f1;
    border-radius: 10px;
    padding: 20px;
    height: fit-content;
    max-height: 80vh;
    overflow-y: auto;
}

body.dark .calculator-history {
    background-color: #2d2d2d;
}

.history-item {
    margin-bottom: 10px;
}

@media (max-width: 768px) {
    .calculator-history {
        margin-top: 20px;
        max-height: 300px;
        overflow-y: auto;
    }
}